Bubble in one of the front tires!

I just discovered a bubble on the sidewall in on of my wife's front tires. I am pretty sure I will need to replace it with a new one. However, the other three tires have about 15k miles on it. Should I replace the other front tire and have two new tires in the front or maybe the back instead of just one? Do most people in my situation replace just the bad tire or both? Any help will be greatly appreciated, I will stop at the Goodyear dealer near me to replace it, let me know what is the safest way to go! Thanks

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